Dalibor Farny Puri Nixie, Руководство пользователя

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At this moment, the browser is disconnected from the clock and is connecting back to your Wi-Fi router.
Once the browser is connected to the internet, it will check the connection between the clock and the
internet and if all is correct, it provides you a button to access settings “Customize it”. You can also go to
My Devices in the left menu and access the settings of the clock from here.
Last modified: 21 November 2021
2.6. Timekeeping
Features
1. Real-time clock module (RTC) – RTC is a module that keeps time and serves as a primary
source of actual time for the clock. The clock can read the time from the module when it needs to
and update the time on the RTC when it receives fresh time from the internet. RTC module keeps
running even when the clock is powered off, thanks to the supercapacitor power backup –
providing time instantly after startup of the clock before connecting to the internet. The time stored
in the RTC module will drift over time, so it needs to be synchronized periodically, otherwise, the
time displayed on the clock will not be accurate. This is normally done automatically when the
clock syncs the time from the internet. In
offline mode , it needs to be done manually .
2. Supercapacitor power backup – If the clock is powered off, the RTC needs an alternate energy
source. For this purpose, the clock uses a supercapacitor that can provide energy for several
days, which is enough for common power outages. If the clock is powered off for a longer time, the
supercapacitor is eventually drained and the time in the RTC is lost. The supercapacitor is fully
charged within a few minutes after the startup of the clock. There is no wear on this part, so it will
not deteriorate with use and will never need to be replaced. The supercapacitor provides energy
only for the RTC module, not for the nixie tubes or for the main microprocessor – the nixie tubes
are off and the clock is reported as offline in the apps when powered off.
Timekeeping in online mode
The Puri Nixie Clock in online mode periodically synchronizes time from the internet. As long as the
internet is available, the clock updates its time. If the internet is not available for a long time (days,
weeks), the clock keeps running, but its time will eventually drift. The time is kept for several days even
when the clock is powered off thanks to the RTC module with supercapacitor power backup.
It first tries to obtain the current time from its internal real-time clock module (RTC) when the clock starts
up. If the time is unavailable (the clock was powered off for more than a couple of days and the
supercapacitor backup is discharged), the clock assumes 00:00 and will show zeros at the display. A few
seconds after the start, the clock will attempt to connect to a known wifi network. If it succeeds, it sets
the time from the internet and stores it also in the RTC. That initial time accuracy is somewhere around 1
second. You can observe that on accurate time sources, e.g.
https://time.is . After another 10 seconds,
the clock will start NTP time synchronization from an NTP server closest to your location. Using the NTP
service, the clock will increase its accuracy to tens of milliseconds off from the actual time. The time is
periodically updated via NTP in longer intervals during the operation of the clock.
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